<?php // $Id: category.php,v 1.24.2.4 2008/11/27 07:30:11 tjhunt Exp $
/**
 * Allows a teacher to create, edit and delete categories
 *
 * @author Martin Dougiamas and many others.
 *		 {@link http://moodle.org}
 * @license http://www.gnu.org/copyleft/gpl.html GNU Public License
 * @package questionbank
 */

	require_once("../config.php");
	require_once($CFG->dirroot."/question/editlib.php");
	require_once($CFG->dirroot."/question/category_class.php");



	list($thispageurl, $contexts, $cmid, $cm, $module, $pagevars) = question_edit_setup('categories');

	// get values from form for actions on this page
	$param = new stdClass();


	$param->moveup = optional_param('moveup', 0, PARAM_INT);
	$param->movedown = optional_param('movedown', 0, PARAM_INT);
	$param->moveupcontext = optional_param('moveupcontext', 0, PARAM_INT);
	$param->movedowncontext = optional_param('movedowncontext', 0, PARAM_INT);
	$param->tocontext = optional_param('tocontext', 0, PARAM_INT);
	$param->left = optional_param('left', 0, PARAM_INT);
	$param->right = optional_param('right', 0, PARAM_INT);
	$param->delete = optional_param('delete', 0, PARAM_INT);
	$param->confirm = optional_param('confirm', 0, PARAM_INT);
	$param->cancel = optional_param('cancel', '', PARAM_ALPHA);
	$param->move = optional_param('move', 0, PARAM_INT);
	$param->moveto = optional_param('moveto', 0, PARAM_INT);
	$param->edit = optional_param('edit', 0, PARAM_INT);

	$qcobject = new question_category_object($pagevars['cpage'], $thispageurl, $contexts->having_one_edit_tab_cap('categories'), $param->edit, $pagevars['cat'], $param->delete,
								$contexts->having_cap('moodle/question:add'));

	$streditingcategories = get_string('editcategories', 'quiz');
	if ($param->left || $param->right || $param->moveup || $param->movedown|| $param->moveupcontext || $param->movedowncontext){
		confirm_sesskey();
		foreach ($qcobject->editlists as $list){
			//processing of these actions is handled in the method where appropriate and page redirects.
			$list->process_actions($param->left, $param->right, $param->moveup, $param->movedown,
									$param->moveupcontext, $param->movedowncontext, $param->tocontext);
		}
	}
	if ($param->delete && ($questionstomove = count_records("question", "category", $param->delete))){
		if (!$category = get_record("question_categories", "id", $param->delete)) {  // security
			error("No such category {$param->delete}!", $thispageurl->out());
		}
		$categorycontext = get_context_instance_by_id($category->contextid);
		$qcobject->moveform = new question_move_form($thispageurl,
					array('contexts'=>array($categorycontext), 'currentcat'=>$param->delete));
		if ($qcobject->moveform->is_cancelled()){
			redirect($thispageurl->out());
		}  elseif ($formdata = $qcobject->moveform->get_data()) {
			/// 'confirm' is the category to move existing questions to
			list($tocategoryid, $tocontextid) = explode(',', $formdata->category);
			$qcobject->move_questions_and_delete_category($formdata->delete, $tocategoryid);
			$thispageurl->remove_params('cat', 'category');
			redirect($thispageurl->out());
		}
	} else {
		$questionstomove = 0;
	}
	if ($qcobject->catform->is_cancelled()) {
		redirect($thispageurl->out());
	} else if ($catformdata = $qcobject->catform->get_data()) {
		if (!$catformdata->id) {//new category
			$qcobject->add_category($catformdata->parent, $catformdata->name, $catformdata->info);
		} else {
			$qcobject->update_category($catformdata->id, $catformdata->parent, $catformdata->name, $catformdata->info);
		}
		redirect($thispageurl->out());
	} else if ((!empty($param->delete) and (!$questionstomove) and confirm_sesskey()))  {
		$qcobject->delete_category($param->delete);//delete the category now no questions to move
		$thispageurl->remove_params('cat', 'category');
		redirect($thispageurl->out());
	}
	$navlinks = array();
	if ($cm!==null) {
		// Page header
		$strupdatemodule = has_capability('moodle/course:manageactivities', $contexts->lowest())
			? update_module_button($cm->id, $COURSE->id, get_string('modulename', $cm->modname))
			: "";
		$navlinks[] = array('name' => get_string('modulenameplural', $cm->modname),
							'link' => "$CFG->wwwroot/mod/{$cm->modname}/index.php?id=$COURSE->id",
							'type' => 'activity');
		$navlinks[] = array('name' => format_string($module->name),
							'link' => "$CFG->wwwroot/mod/{$cm->modname}/view.php?id={$cm->id}",
							'type' => 'title');
	} else {
		// Print basic page layout.
		$strupdatemodule = '';
	}

	if (!$param->edit){
		$navlinks[] = array('name' => $streditingcategories, 'link' => '', 'type' => 'title');
	} else {
		$navlinks[] = array('name' => $streditingcategories, 'link' => $thispageurl->out(), 'type' => 'title');
		$navlinks[] = array('name' => get_string('editingcategory', 'question'), 'link' => '', 'type' => 'title');
	}

	$navigation = build_navigation($navlinks);
	print_header_simple($streditingcategories, '', $navigation, "", "", true, $strupdatemodule);

	// print tabs
	if ($cm!==null) {
		$currenttab = 'edit';
		$mode = 'categories';
		${$cm->modname} = $module;
		include($CFG->dirroot."/mod/{$cm->modname}/tabs.php");
	} else {
		$currenttab = 'categories';
		$context = $contexts->lowest();
		include('tabs.php');
	}

	// display UI
	if (!empty($param->edit)) {
		$qcobject->edit_single_category($param->edit);
	} else if ($questionstomove){
		$qcobject->display_move_form($questionstomove, $category);
	} else {
		// display the user interface
		$qcobject->display_user_interface();
	}
	print_footer($COURSE);
?>
